I've been trying to fire up Metro 2033 again for the better part of the day but have been unable to run the game due to a problem with Steam, apparently. When I click on the game's shortcut, Steam attempts to install an update, but is interrupted. I then get a message that says, "Unable to open SteamTmp.exe for writing." Steam support insists that it is either my anti-virus software or Windows Defender. I've tried disabling both -- and the firewall, too -- to install the update. No go. This is the first time I've encountered an issue with Steam for which I've been unable to find a solution online. Does anybody have any suggestions? I'd really like to avoid the hassle of uninstalling everything at this point. Any help will be greatly appreciated.